This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

Why I cannot download firmware into my 52840? USB cable is the only power supply.

I connect VBUS to VDDH, and use a USB cable for power supply(high voltage mode), but I cannot download firmware into the 52840.

Unless I power the 52840 from the VDD pin, why?

My cricuit as below:

Parents Reply
  • I realize this, but the REGOUT0 is default output 1.8V, if I cannot download firmware at first, how could I configure it to 3.3V?

    now our prototype is designd with high voltage mode powerd by a USB cable, and I didn't design test point for the VDD, this mean if I want to download firmware into the chip, I must power the chip from the VDD pin with 3.3V by soldering a jumper, this is very inconvenient.

    The default output voltage dose not support firmware downloading is incomprehensible. Or I have some misunderstanding about this?

    Do other customers have no such troubles?

Children
Related